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对离子色谱法测定饮用水中硝酸根离子的不确定度进行了评定。结果表明,饮用水中硝酸根离子浓度为3.09mg/L,扩展不确定度为0.058mg/L,不确定度的主要来源包括拟合标准工作曲线产生的不确定度、标准储备溶液的制备过程带来的不确定度和仪器重复测量以及移液管使用带来的不确定度。
The uncertainty of determination of nitrate ion in drinking water by ion chromatography was evaluated. The results showed that the concentration of nitrate ion in drinking water was 3.09mg / L with an extended uncertainty of 0.058mg / L. The main sources of uncertainty included the uncertainty of fitting standard working curve, the preparation of standard stock solution Uncertainties and repeated measurements of instruments and pipette uncertainty.